The bottleneck effect.
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The population needs to be small is the necessary condition for genetic drift to have a significant effect on populations.
Genetic drift is the random change in the frequency of alleles within a population's gene pool. It can cause the genetic composition of a population to change in one direction or another. Combined with natural selection, genetic drift is a principal force in biological evolution.Another Answer:Genetic drift is where random chance events which can effect the gene's abundance in a population, regardless of whether the gene is advantageous or not. For example, a natural disaster kills animals indiscriminately, regardless of their genetic makeup.
Change in the genetic composition of a population during successive generations, as a result of natural selection acting on the genetic variation among individuals, and resulting in the development of new speciesRead more: evolution
When there is low genetic variation in a population the species produced are unlikely to withstand diseases.
hemophilia
True
Genetic variation allows a population to adapt to a changing environment.
A large population..
A widespread disaster would reduce the variety within the human genetic pool by eliminating all but certain segments of the population. A global plague could potentially have the greatest effect, as plagues (see: black plague, Spanish influenza) often will often decimate all of a local population save for those with genetic immunity--thus standardizing that mutation in future populations. Global catastrophe could also inhibit travel, and would limit human reproduction to their immediate region, limiting the genetic range of potential offspring.
The genetic variation of a population is a measure of how much individuals in a population differ genetically.
Genetic variability is the tendency of individual genetic characteristics in a population to vary from one another.